| 摘要 |
An articulated power lifting machine has a tool at the end of its working arm. The position of the sections of the working arm is sensed and made to operate a tool levelling system. That same sensor is made to move counterweights in a system which achieves simplicity by treating the need for counterweighting as equal, except for reference point of movement, as equivalent to the need for levelling. The arrangement lends itself to use with a transporter which is constructed building block style.
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